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[truetype] Ignore invalid MVAR tags. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=838

* src/truetype/ttgxvar.c (ft_var_load_mvar): Ignore value and emit
warning for invalid tags.
(tt_apply_mvar): Ignore invalid tags.
This commit is contained in:
Werner Lemberg 2017-03-13 07:42:34 +01:00
parent 5eb0fd5e97
commit 447a0b6263
2 changed files with 35 additions and 11 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2017-03-13 Werner Lemberg <wl@gnu.org>
[truetype] Ignore invalid MVAR tags.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=838
* src/truetype/ttgxvar.c (ft_var_load_mvar): Ignore value and emit
warning for invalid tags.
(tt_apply_mvar): Ignore invalid tags.
2017-03-12 Werner Lemberg <wl@gnu.org>
[truetype] Store and use design coordinates also.

34
src/truetype/ttgxvar.c
View File

@ -1263,7 +1263,16 @@
FT_Short* p = ft_var_get_value_pointer( face, value->tag );
value->unmodified = *p;
if ( p )
value->unmodified = *p;
#ifdef FT_DEBUG_LEVEL_TRACE
else
FT_TRACE1(( "ft_var_load_mvar: Ignoring unknown tag `%c%c%c%c'\n",
(FT_Char)( value->tag >> 24 ),
(FT_Char)( value->tag >> 16 ),
(FT_Char)( value->tag >> 8 ),
(FT_Char)( value->tag ) ));
#endif
}
face->variation_support |= TT_FACE_FLAG_VAR_MVAR;
@ -1320,17 +1329,20 @@
value->outerIndex,
value->innerIndex );
FT_TRACE5(( "value %c%c%c%c (%d units) adjusted by %d units (MVAR)\n",
(FT_Char)( value->tag >> 24 ),
(FT_Char)( value->tag >> 16 ),
(FT_Char)( value->tag >> 8 ),
(FT_Char)( value->tag ),
value->unmodified,
delta ));
if ( p )
{
FT_TRACE5(( "value %c%c%c%c (%d units) adjusted by %d units (MVAR)\n",
(FT_Char)( value->tag >> 24 ),
(FT_Char)( value->tag >> 16 ),
(FT_Char)( value->tag >> 8 ),
(FT_Char)( value->tag ),
value->unmodified,
delta ));
/* since we handle both signed and unsigned values as FT_Short, */
/* ensure proper overflow arithmetic */
*p = (FT_Short)( value->unmodified + (FT_Short)delta );
/* since we handle both signed and unsigned values as FT_Short, */
/* ensure proper overflow arithmetic */
*p = (FT_Short)( value->unmodified + (FT_Short)delta );
}
}
/* adjust all derived values */